Development of the Effective Defrosting Criterion for Electric Vehicles Transcritical CO2 Heat Pumps Under Constant Heating Capacity Operation
Development of the Effective Defrosting Criterion for Electric Vehicles Transcritical CO2 Heat Pumps Under Constant Heating Capacity Operation
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DOI：
10.1016/j.ijrefrig.2022.10.023
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发表时间：
2022-10
影响因子：
3.9
通讯作者：
Anci Wang;F. Cao;Fan Jia;Yuxuan Liu;Xiang Yin;Yulong Song;Xiaolin Wang
中科院分区：
文献类型：
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作者：
Anci Wang;F. Cao;Fan Jia;Yuxuan Liu;Xiang Yin;Yulong Song;Xiaolin Wang
对于电动汽车热泵来说，乘客舒适度优先于加热性能。但是，结霜会导致换热性能下降，导致制热量耗散。研究了电动汽车CO2热泵在恒制热量工况下结霜过程的动态特性。此外，研究发现，定制热量运行下的参数的动态特性显着不同，在恒定的压缩机转速运行。将传统热泵启动故障的判断标准应用于电动汽车热泵会导致严重的误启动现象，甚至损坏压缩机和管路。因此，提出了一种新的基于动态特性的电动汽车热泵启动判据。通过在不同供热需求工况下的应用，验证了新启动方法的可靠性。最后，对采用新型PTC启动方式的电动汽车热泵与传统PTC辅助加热方式的平均性能进行了比较。结果表明，在不同的环境条件下，采用新的启动判据的热泵具有明显的性能优势。
Passenger comfort takes precedence over heating performance for electric vehicle heat pumps. However, frost formation will cause the heat exchange performance to decrease, leading to the heating capacity dissipation. The dynamics of an electric vehicle CO2heat pump under constant heating capacity operation during the frosting process were revealed. Moreover, it was found that the dynamic characteristics of parameters under constant heating capacity operation were significantly different from those under constant compressor speed operation. The application of defrosting initiation judgment criteria based on traditional heat pumps to electric vehicle heat pumps would lead to some serious false defrosting phenomena and even damage the compressor and pipelines. Therefore, a new defrosting initiation criterion was proposed for electric vehicle heat pumps based on the dynamic characteristics. Then, the reliability of the new initiation was verified by applying it in different heating demand operations. Finally, the average performance of electric vehicle heat pumps adopting the new defrost initiation was compared with the traditional PTC auxiliary heating method. The conclusion demonstrated that the heat pump with the new defrost initiation criterion had obvious performance advantages under different environmental conditions.